Nor-tropane derivatives, and their application in therapeutics

ABSTRACT

Novel 3 β-aroylamino and 3 β-heteroaroylamino nor-tropanes and granatanes are provided having the general formula: ##STR1## Wherein n=1 or 2, R represents a benzyl or a substituted benzyl group and A-CO represents one of a specific range of aroyl groups. The compounds of the invention are useful in the treatment of psychism or digestive troubles.

The present invention relates to new nor-tropane and granatane derivatives, more especially to new 3-aroylamino and 3-heteroaroylamino nor-tropanes and granatanes, respectively substituted in position -8 and -9, the process for preparing same and the application of same in therapeutics.

These new compounds correspond more precisely to the general formula: ##STR2## in which:

n assumes the values 1 or 2;

R represents a benzyl group; a benzyl group substituted by one or two halogen atoms, a methyl group or a cyano group or a (furyl-3)methyl chain; and --A--CO represents:

a pyrimidinic group of structure: ##STR3## in which R₁ represents a methyl or ethyl group; R₂ represents an alkyloxy group with 1 or 2 carbon atoms or an amino group; and R₃ represents a hydrogen atom, a bromine atom or a methoxy group, a nitro group, an acetyl group or an alkylmercapto group with 1 or 2 carbon atoms; the whole (R₃ l, n, R) however not being able to assume the value (H, 1, benzyl); or

an aromatic group of structure: ##STR4## in which R₁ ═CH₃ or C₂ H₅ and x═Br or Cl, the whole (X, n, R₁, R) however not being able to assume the following values: ##STR5##

The compounds preferred among those of formula (I) are the compounds for which the pair (n, R) assumes the value:

(1, benzyl) and the whole (R₁, R₂, R₃) assumes the following values: (CH₃, NH₂, Br); (C₂ H₅, OC₂ H₅, H), (CH₃, OCH₃, OCH₃); (C₂ H₅, OCH₃, H); (CH₃, OC₂ H₅, H); (C₂ H₅, OCH₃, OCH₃); (CH₃, OCH₃,NO₂); (CH₃, OCH₃, Br); (CH₃, OCH₃, SCH₃); (CH₃, OCH₃, C₂ H₅ S); (CH₃, OCH₃, COCH₃);

(2, benzyl) and the whole (R₁, R₂, R₃) assumes the values (C₂ H₅, OCH₃, H), (CH₃, OCH₃, H); ##STR6## and the whole (R₁, R₂, R₃) assumes the value (CH₃,OCH₃, H); ##STR7## and the whole (R₁, R₂, R₃) assumes the value (C₂ H₅,OCH₃, H); ##STR8## and the pair (R₁, X)═(CH₃, Br); ##STR9## and the pair (R₁, X) assumes the value (C₂ H₅, Br), or ##STR10## and the pair (R₁, X) assumes the value (CH₃, Cl).

It should be noted that in formula (I) the A--CO--NH chain is in the equatorial position and the tropanes, nor-tropanes and granatanes having such a substituent in the equatorial position will be called β in what follows.

The present invention of course also relates to the salts of the compounds of formula (I) and more precisely the pharmaceutically mineral or organic acid addition salts.

The compounds of formula (I) of the invention are obtained by condensing, by means of the mixed anhydride method, the acids of formula:

    A--COOH                                                    (II)

in which A--CO has the same meaning as in formula (I), with the 3 β-amino nor-tropanes and 3 β-amino granatanes of formula: ##STR11## in which R and n have the same meanings as in formula (I).

The compounds of formula (I) of the invention, except those for which R₂ represents an amino group and those for which the A--CO pattern has the following structure: ##STR12## where R₁ and X have the same meanings as above, may also be obtained by condensing, preferably in a tetrahydrofuranic medium and in the presence of triethylamine, the compounds of formula (III) previously defined, with the acid chlorides of the compounds of formula:

    A'--COOH                                                   (II')

where A'--CO has the same meaning as A--CO in formula (I) with however the above stated restrictions as regards R₂ and without being able to have the structure: ##STR13##

Finally, the compounds of formula (I) of the invention, except those for which the A--CO pattern has the particular structure: ##STR14## and those for which R represents a benzyl group, may also be prepared by condensation of the compounds of formula: ##STR15## in which n=1 or 2 and A"--CO has the same meanings as A--CO in formula (I) with however the above stated restrictions, with the compounds of formula:

    X'--R'                                                     (V)

where X' is a chlorine or bromine atom or a mesyloxy or tosyloxy group, and R' has the same meaning as R in formula (I) without however being able to represent a benzyl group, this condensation reaction being carried out preferably at reflux in an organic solvent such as acetone, acetonitrile or DMF and in the presence of a base such as potassium carbonate or triethylamine.

The compounds of formula (III) may be prepared in accordance with the processes described in French patent application No. 2 446 823 and Belgian Pat. No. 881 134.

The compounds of formula (IV) are obtained by hydrogenolysis, preferably in an acid alcohol medium, at ambient temperature, at a pressure of 90 m bars and in the presence of palladium on carbon (10% of palladium) of the compounds of formula (I) having the particular structure: ##STR16## in which n and A"--CO have the same meanings as in formula (IV), A"--CO not however being able to represent the pattern: ##STR17## where R₁ has the same meanings as in formula (I), and the compounds of formula (IV) having the particular structure: ##STR18## in which R₁ and n have the same meanings as in formula (I), are obtained by bromation, preferably in an acetic acid medium, of the compounds of formula: ##STR19## in which R₁ and n have the same meanings as in formula (IVa).

The compounds of formula (VI) are themselves obtained by hydrogenolysis of the compounds of formula (I) having the particular structure: ##STR20## in which R₁ and n have the same meanings as in formula (IV).

Some compounds of formula (II) are new. It is a question more precisely of those having the particular formula: ##STR21## in which R₃ ' represents an alkylmercapto group with 1 or 2 carbon atoms or an acetyl group.

The compounds of formula (IIa) for which R₃ ' represents an alkylmercapto group with 1 or 2 carbon atoms are obtained by a two step process which consists in reducing by means of tin in a hydrochoric medium, the compound of formula: ##STR22## then in treating the intermediate compound thus obtained with the corresponding alkyl sulfate having 1 to 2 carbon atoms in the presence of aqueous sodium hydroxide.

The compound of formula (IIb) is obtained by treating, by means of chlorosulfonic acid (ClSO₃ H), the compound of formula: ##STR23##

The compound of formula (IIa) for which R₃ ' represents an acetyl group is obtained by oxidizing, by means of the pyridinium chloride-chromic oxide complex, the compound of formula: ##STR24##

Finally, the compound of formula (IId) is obtained by a two stage process which consists in treating the compound of formula: ##STR25## by means of a lithium containing derivative of formula CH₃ -Li, then in reacting, on the intermediate compound thus obtained, carbon dioxide.

The following preparations are given by way of example to illustrate the invention.

EXAMPLE 1: 3β-[(2,3-diethoxy) benzoyl]amino 8-benzyl nor-tropane hydrochloride (I) Code number: 115

A solution of 10 g of 2,3-diethoxybenzoic acid in 30 ml of thionyl chloride is brought to reflux for 3 hours, then the thionyl chloride is evaporated, the residue is taken up in toluene, the toluene is evaporated and the residue is slowly added to a solution cooled to 0° C. of 10 ml of triethylamine and 9.85 g of 3β-amino 8-benzyl nor-tropane in 250 ml of tetrahydrofuran. It is left to return to ambient temperature with stirring for 2 h 30 mn, filtered, the filtrate is evaporated, the residue is taken up in carbonated water, extracted with methylene chloride, washed with water, dried on sodium sulfate, filtered and the filtrate evaporated. The residue is dissolved in 150 ml of ethyl acetate and 9.17 ml of 4N ethanolic hydrochloric acid are added. Then it is filtered and the precipitate recrystallized in ethanol. Thus 6 g of the expected compound were obtained.

Yield: 82%

Melting point: 220° C.

Empirical formula: C₂₅ H₃₃ ClN₂ O₃

Molecular weight: 444.987

Elementary analysis

    ______________________________________                                                    C         H      N                                                  ______________________________________                                         Calculated (%)                                                                              67.47       7.48   6.31                                           Obtained (%) 67.28       7.42   6.51                                           ______________________________________                                    

By the same process, but from the corresponding reagents, the compounds of formula (I) were obtained having code numbers: 112, 113, 118, 120, 129, 135, 139 to 143, 145, 147, 148, 155, 168, 171, 173 and 174 and appearing in table I below.

EXAMPLE 2: 3β-(2,3-dimethoxy benzoyl) amino 8-parachloro benzyl nor-tropane (I) Code number: 112

To a solution, cooled to 0° C., of 17 g of (2,3-dimethoxy)benzoic acid and 10.1 ml of triethylamine in 350 ml of methylene chloride, are added 6.85 ml of ethyl chloroformiate. After 30 mn at 0° C., 15.6 g of 3β-amino 8-parachloro benzyl nor-tropane are slowly added. It is agitated for an hour at ambient temperature, then washed with water, decanted, the organic phase is evaporated and the residue crystallized in an isopropylic ether/ethyl acetate (75/25) mixture. After recrystallization in acetone the expected compound is obtained:

Yield: 75%

Melting point: 131° C.

Empirical formula: C₂₃ H₂₇ Cl N₂ O₃

Molecular weight: 414.919

Elementary analysis:

    ______________________________________                                                    C         H      N                                                  ______________________________________                                         Calculated (%)                                                                              66.57       6.56   6.75                                           Obtained (%) 66.67       6.70   6.75                                           ______________________________________                                    

By the same process, but from the corresponding reagents, the compounds of formula (I) are obtained having code numbers 106, 113, 115, 118, 120, 121, 123, 126, 127, 129, 131, 132, 135, 139 to 143, 145, 147, 148, 155, 168, 169, 171, 173, 174 and 180 appearing in table I below.

EXAMPLES 3: 3β-[(2,3-dimethoxy) benzoyl] amino 8-metafluorobenzyl nor-tropane (I) Code number: 113

A suspension of 8 g of 3β-[(2,3-dimethoxy) benzoyl] amino nor-tropane [(IV), code number 111, prepared in example 4], 5.18 g of metafluorobenzyl chloride and 11.4 of potassium carbonate in 100 ml of acetone is brought to reflux for 12 hours. Then it is filtered, the filtrate evaporated, the residue taken up in methylene chloride washed with water, dried on sodium sulfate, filtered, the filtrate is evaporated and the residue crystallized in petroleum ether. After recrystallization in isopropylic ether, 8.6 g of the expected product are obtained.

Yield: 78%

Melting point: 97° C.

Empirical formula: C₂₃ H₂₇ FN₂ O₃

Molecular weight: 398.462

Elementary analysis:

    ______________________________________                                                    C         H      N                                                  ______________________________________                                         Calculated (%)                                                                              69.32       6.83   7.03                                           Obtained (%) 69.34       6.75   6.94                                           ______________________________________                                    

By the same process, but from the corresponding reagents, the compounds of formula (I) are obtained appearing in table I below under the code numbers: 112, 118, 120, 121, 123, 126, 129, 131, 132, 145, 155, 169, 173 and 180.

EXAMPLE 4: 3β-[(2,3-dimethoxy)benzoyl] amino nor-tropane (IV) Code number: 111

A suspension of 87.9 g of 3β-[(2,3-dimethoxy)benzoyl] amino 8-benzyl nor-tropane (I) and 18 g of 10% palladium carbon (in a 50% suspension in water) in 900 ml of ethanol at 96°, is hydrogenolyzed in an autoclave at a pressure of 90 m bars. Then it is filtered, the filtrate evaporated, the residue is taken up in water, alkalized with sodium carbonate, extracted with methylene chloride, dried on sodium sulfate, and filtered, the filtrate is evaporated, the residue is crystallized in pretroleum ether and recrystallized in ethyl acetate. Thus, 62 g of the expected compound are isolated.

Yield: 92%

Melting point: 119° C.

Empirical formula: C₁₆ H₂₂ N₂ O₃

Molecular weight: 290.352

Elementary analysis:

    ______________________________________                                                    C         H      N                                                  ______________________________________                                         Calculated (%)                                                                              66.18       7.64   9.65                                           Obtained (%) 66.23       7.38   9.87                                           ______________________________________                                    

By the same process, but from the corresponding reagents, the compounds of formula (IV) were obtained, required for the synthesis of the compounds of formula (I) according to example 3, as well as the compounds of formula (VI), more especially 3β-[(4-amino 2-ethoxy) benzoyl] amino nor-tropane [code number: 176; melting point: 200° C.] required for synthesis of the compounds of formula (IVa) according to the following example 5.

EXAMPLE 5: 3β-[(5-bromo 4-amino 2-ethoxy) benzoyl] amino nor-tropane (IVa) Code number: 177

To a solution of 10 g of 3β-[(4-amino 2-ethoxy) benzoyl] amino nor-tropane in 100 ml of acetic acid, cooled to 10° C., 2 ml of bromine are slowly added. This it is left to return to ambient temperature, the precipitate formed is filtered, taken up in isopropylic ether, filtered and recrystallized in 96° alcohol. Thus, 7.4 g of the expected product are obtained.

Yield: 50%

Melting point: >260° C.

NMR spectrum (DMSO): δ(ppm)

=9.3, s, 1 amidic proton: 7.8 and 6.6 s, 2 aromatic protons and 1 amidic proton; 6.00, s, 2 amino protons; 4.00., m, 5 protons: --O--CH₂ and 3 tropanic protons (in α of the nitrogen atoms);

2.00, m, 8 tropanic protons;

1.4, t, O--CH₂ --CH₃ (3 protons)

By the same process, but from the corresponding reagents, the compounds of formula (IVa) are obtained, required for the synthesis of the corresponding compounds of formula (I) in example 3.

EXAMPLE 6: 5-methylmercapto 2,3-dimethoxy benzoic acid [(IIa), R₃ '=SCH₃ ]

To a solution, cooled to -5° C., of 511.7 g (200 ml) of chlorosulfonic acid (ClSO₃ H) are slowly added 80 g of 2,3-dimethoxy benzoic acid. Then the temperature is allowed to rise to 15° C., the mixture is poured into a solution of water and ice, and the precipitate formed is filtered. Thus, 100 g (yield: 80%) of 5-chlorosulfonyl 2,3-dimethoxy benzoic acid are obtained [(IIb), Melting point: 157° C.].

71 g of this compound are placed in solution in 1 liter of concentrated hydrochloric acid and 30 g of tin are slowly added. Then it is left at ambient temperature for a night, the precipitate formed is filtered, recrystallized in isopropylic ether and dissolved in an aqueous solution of 40 g of sodium hydroxide in 800 ml of water. Then 63 g of methyl sulfate are slowly added and it is left for a night of ambient temperature. Then it is acidified by means of concentrated hydrochloric acid, the precipitate formed is filtered and dried under vacuum. Thus, 34 g of the expected product are isolated.

Yield: 60%

Melting point: 92° C.

By the same process, but from the corresponding reagents, 5-ethylmercapto 2,3-dimethoxy benzoic acid was obtained [(IIa), R₃ '=S-Et,

Melting point: 66° C.].

EXAMPLE 7: 5-(1-hydroxy ethyl)2,3-dimethoxy benzoid acid [(IId)].

To 310 ml of a 1.4 M methylithium ethereal solution (cooled to -30° C.) a solution of 30 g of 3-bromo 4,5-dimethoxy benzaldehyde is slowly added while maintaining the temperature at -30° C. Then, after 3 hours of reaction, CO₂ gas is added, and the temperature is allowed to rise to 20° C., the mixture is thrown into water, basified with concentrated sodium hydroxide, the ethereal phase is decanted, the aqueous phase is washed with ethyl acetate, then acidified with concentrated hydrochloric acid and extracted with ether. It is dried on sodium sulfate, filtered, the filtrate is evaporated and the residue crystallized in isopropylic ether. 5.9 g of the expected product are obtained.

Yield: 21%

Melting point: 134° C.

EXAMPLE 8: 5-acetyl 2,3-dimethoxy benzoic acid [(IIa), R₃ '=COCH₃ ]

A suspension of 8.8 g of compound (IId) obtained in the preceding example and 36 g of manganese dioxide in 100 ml of dioxane is brought to reflux for three hours. Then it is filtered, the filtrate is evaporated and the residue is crystallized in isopropylic ether. 7.2 g of the expected acid are obtained.

Yield: 82%

Melting point: 125° C.

Empirical formula: C₁₁ H₁₂ O₅

Molecular weight: 224.21 p Elementary analysis:

    ______________________________________                                                          C    H                                                        ______________________________________                                         Calculated (%)     58.92  5.40                                                 Obtained (%)       58.43  5.41                                                 ______________________________________                                    

    TABLE I       ##STR26##        Melting  Code  Empirical Molecular point Yield ELEMENTARY ANALYSIS      n° ACO n R Form formula weight (°C.) (%) % C H N                     106       ##STR27##       1       ##STR28##       Base C.sub.22 H.sub.26 BrN.sub.3 O.sub.2 444.361 122 47 Cal.Obt.      59.4659.25 5.905.91  9.469.46       112      ##STR29##       1       ##STR30##       Base C.sub.23 H.sub.27 ClN.sub.2 O.sub.3 414.919 131 75 Cal.Obt.      66.5766.67 6.566.70  6.756.75       113      ##STR31##       1       ##STR32##       Base C.sub.23 H.sub.27 FN.sub.2 O.sub.3 398.462  97 78 Cal.Obt.      69.3269.34 6.836.75  7.036.94       115      ##STR33##       1       ##STR34##       HCl C.sub.25 H.sub.33 ClN.sub.2 O.sub.3 444.987 220 82 Cal.Obt.      67.4767.28 7.487.42  6.316.51       118      ##STR35##       1       ##STR36##       Base C.sub.24 H.sub.30 N.sub.2 O.sub.3 394.496       81 60 Cal.Obt. 73.0772.98 7.677.69  7.107.04       120      ##STR37##       1       ##STR38##       Base C.sub.24 H.sub.30 N.sub.2 O.sub.31/6 H.sub.2 O 397.499  99 74      Cal.Obt. 72.5172.55 7.697.85  7.056.99       121      ##STR39##       1       ##STR40##       Base C.sub.22 H.sub.25 BrClN.sub.3 O.sub.2 478.810 215 75 Cal.Obt.      5      55.185.13 5.265.41  8.788.63       123      ##STR41##       1       ##STR42##       Base C.sub.23 H.sub.27 BrClN.sub.3 O.sub.2 492.836 150 84 Cal.Obt.      5      56.055.92 5.525.50  8.538.41       126      ##STR43##       1       ##STR44##       Base C.sub.23 H.sub.27 BrClN.sub.3 O.sub.2 492.836 194 76 Cal.Obt.      5      56.056.06 5.525.60  8.538.52       127      ##STR45##       1       ##STR46##       Base C.sub.22 H.sub.25 ClFN.sub.3 O.sub.2 417.901 160 80 Cal.Obt.      63.2363.23 6.036.17 10.0610.16       129      ##STR47##       1       ##STR48##       Base C.sub.23 H.sub.27 BrN.sub.2 O.sub.3 459.371 146 73 Cal.Obt.      60.1360.35 5.925.88  6.106.02       131      ##STR49##       1       ##STR50##        Base C.sub.22 H.sub.25 BrFN.sub.3 O.sub.2 462.353 209 32 Cal.Obt.      5      57.157.46 5.455.56  9.099.00       132      ##STR51##       1       ##STR52##       Base C.sub.20 H.sub.24 BrN.sub.3 O.sub.3 434.325 214 35 Cal.Obt.      55.3055.33 5.575.55  9.689.53       135      ##STR53##       1       ##STR54##       Maleate C.sub.28 H.sub.34 N.sub.2 O.sub.8 526.568 160 75 Cal.Obt.      63.8663.78 6.516.71  5.325.06       139      ##STR55##       1       ##STR56##       HCl C.sub.24 H.sub.31 ClN.sub.2 O.sub.3 430.961 245 78 Cal.Obt.      66.8866.99 7.257.13   6.506.54       140      ##STR57##       1 " HCl C.sub.24 H.sub.31 ClN.sub.2 O.sub.3 430.961 230 72 Cal.Obt.      66.8866.68 7.257.36  6.506.54       141      ##STR58##       1 " HCl C.sub.25 H.sub.33 ClN.sub.2 O.sub.4 460.987 198 66 Cal.Obt.      65.1365.03 7.227.30  6.086.11       142      ##STR59##       1 " Base C.sub.23 H.sub.27 N.sub.3 O.sub.5 425.470 149 69 Cal.Obt.      6      64.924.80 6.406.59  9.889.64       143      ##STR60##       2 " HCl C.sub.25 H.sub.33 ClN.sub.2 O.sub.3+ 0.5% H.sub.2 O 447.223 220      55 Cal.Obt. 67.1366.94 7.507.61  6.276.22       145      ##STR61##       1       ##STR62##       HCl C.sub.24 H.sub.29 Cl.sub.3 N.sub.2 O.sub.3 499.859 240 79 Cal.Obt.      57.6657.81 5.856.03  5.605.87       147      ##STR63##       1       ##STR64##       Base C.sub.23 H.sub.27 BrN.sub.2 O.sub.3 459.371 154 54 Cal.Obt.      60.1360.43 5.925.78  6.106.15       148      ##STR65##       2 " HCl C.sub.24 H.sub.31 ClN.sub.2 O.sub.3 430.961 217 70 Cal.Obt.      66.8866.58 7.257.32  6.506.47       155      ##STR66##       1       ##STR67##       HCl C.sub.23 H.sub.28 ClFN.sub.2 O 434.927 226 80 Cal.Obt. 63.5163.61      6.496.61  6.446.68       168      ##STR68##       1       ##STR69##       Base C.sub.24 H.sub.30 N.sub.2 O.sub.3 S 426.56  90 81 Cal.Obt.      67.5767.52 7.097.32  6.576.33       169      ##STR70##       1       ##STR71##       Base C.sub.23 H.sub.28 ClN.sub.3 O.sub.2 413.935 190 75 Cal.Obt.      66.7366.75 6.876.78 10.1510.18       171      ##STR72##       1       ##STR73##       Base C.sub.25 H.sub.30 N.sub.2 O.sub.4 422.51        131 53 Cal.Obt. 71.0670.76 7.167.46  6.636.75       173      ##STR74##       1       ##STR75##       Base C.sub.23 H.sub.27 ClN.sub.2 O.sub.3 414.92   91 76 Cal.Obt.      66.5766.74 6.566.58  6.756.73       174      ##STR76##       1       ##STR77##       Oxalate C.sub.27 H.sub.34 N.sub.2 O.sub.7 S 530.62  167 71 Cal.Obt.      61.1160.83 6.466.39  5.285.04       180      ##STR78##       1       ##STR79##       HCl + 1% H.sub.2 O C.sub.24 H.sub.28 ClN.sub.3 O.sub.3+ 1% H.sub.2 O      446.41  260 78 Cal.Obt. 64.5764.20 6.446.27       9.419.26

The compounds of formula (I) were tested on laboratory animals and showed an activity on the central nervous system (more especially a neuroleptic action) and/or on the digestive system (more especially as accelerators of gastro-intestinal motricity and as antiemetics).

Thus, the psychotropic properties were demonstrated on the one hand on mice, particularly by means of the test of the antagonism to apomorphinic straightenings, which test is carried out according to the method described by G. Gouret et Coll. in the J. Pharmacol. (Paris) 1973, 4, 341 and on the other hand on rat, particularly by means of the test of the antagonism to apomorphine induced stereotypies which test is carried out according to the method described by P. A. J. Janssen, C. I. C. Niemegeers and A. H. M. Jageneau in Arzneim-Forsch. (1960), 10, 1003.

Furthermore, the stair case test carried out on rat according to the method described by M. H. Thiebot, P. Soubrie, P. Simon and J. R. Boissier in Psychopharmacologia (Berl) (1973), 31, 77, has demonstrated the slight sedative effect of compounds (I) with regard to their psychotropi c effect.

To illustrate the invention, some results obtained with the compounds of formula (I) using the above tests are given in the following tables II and III.

                  TABLE II                                                         ______________________________________                                                       Antagonism to apomorphinic                                       Compound tested                                                                              straightenings (mice)                                            Code numbers  ED 50 (mg/kg/i.p.)                                               ______________________________________                                         106           0.053                                                            112           0.029                                                            113           0.016                                                            115           0.038                                                            118           0.016                                                            120           0.032                                                            121           0.024                                                            123           0.041                                                            126           0.054                                                            127           0.007                                                            129           0.008                                                            131           0.013                                                            132           0.12                                                             135           0.010                                                            139           0.010                                                            140           0.019                                                            141           0.035                                                            142           0.012                                                            143           0.025                                                            145           0.3                                                              147           0.042                                                            148           0.008                                                            155           0.005                                                            168           0.28                                                             169           0.034                                                            171           0.029                                                            173           0.013                                                            174           0.034                                                            180           0.010                                                            ______________________________________                                    

                  TABLE III                                                        ______________________________________                                                    Antagonism to the                                                              apomorphine induced                                                 Compounds tested                                                                          stereotypies (rat)                                                                            Stair case test (rat)                                Code numbers                                                                              ED50 (mg/kg/p.o.)                                                                             ED50 (mg/kg/p.o.)                                    ______________________________________                                         106        1.6            8                                                    115        0.22           1.3                                                  123        0.2            1.7                                                  139        0.06           0.3                                                  143        0.26           1.6                                                  169        0.46           3.5                                                  ______________________________________                                    

The activity on the digestive system was demonstrated by the gastric evacuation test on rats, carried out according to the following method. The compounds of formula (I) were administered orally simultaneously with 20 steel balls to wakeful rats starved for 20 hours. The action on the gastric evacuation of the compounds of formula (I) was evaluated 90 minutes after administration, by the percentage of animals whose stomach does not contain any ball, the balls being counted by radiological examination.

To illustrate the invention, some results obtained with the compounds of formula (I) in the above test are given in the following table.

                  TABLE IV                                                         ______________________________________                                         Compounds Gastric evacuation (rat)                                             tested    Dose      % animals whose stomach contains                           Code numbers                                                                             (mg/kg/po)                                                                               no ball after 90 minutes                                   ______________________________________                                         132       0.6       25                                                                   1.3       50                                                                   5         75                                                                   10        100                                                        147       0.3       25                                                                   0.6       63                                                                   10        90                                                         ______________________________________                                    

The antiemetic activity is demonstrated on wakeful dogs, starved for 20 hours, by the percentage of animals completely protected for 30 minutes against vomiting induced by a subcutaneous injection of apomorphine chlorhydrate (0.1 mg/kg) by oral administration (one hour before the apomorphine) of the compounds of formula (I). To illustrate the invention, some results obtained with the compounds of formula (I) in the above test are given in table V below.

                  TABLE V                                                          ______________________________________                                                  Antiemetic activity (dogs)                                            Compounds tested                                                                          Dose          % inhibition of vomiting                              Code numbers                                                                              (mg/kg/po)    induced by apomorphine                                ______________________________________                                         132        0.01          100                                                   147        0.1           100                                                   ______________________________________                                    

The acute toxicity of the compounds of the invention was also tested intraperitoneally on mice. Table VI below gives, by way of examples, some results obtained.

                  TABLE VI                                                         ______________________________________                                         Compounds tested                                                                              Toxicity (mice)                                                 Code numbers   LD 50 (mg/kg/i.p.)                                              ______________________________________                                         106            160                                                             112            220                                                             113            140                                                             115            53                                                              118            90                                                              120            100                                                             121            250                                                             123            >400                                                            126            >400                                                            127            200                                                             129            180                                                             131            250                                                             132            200                                                             135            70                                                              139            76                                                              140            70                                                              141            115                                                             142            87.5                                                            143            110                                                             145            >400                                                            147            165                                                             148            100                                                             155            140                                                             169            70                                                              171            115                                                             173            160                                                             174            95                                                              180            275                                                             168            120                                                             ______________________________________                                    

The difference between toxic doses and active doses allows the therapeutical use of the compounds of formula (I) in the treatment of disturbances of the psychism and/or of the digestive system.

They will be preferably administered in the form of pharmaceutical compositions comprising one or more compounds of formula (I), if need be in association with a pharmaceutically acceptable vehicle.

For example, they will be administered orally in the form of tablets, pills or capsules containing 50 to 300 mg of active ingredient (3 to 8 per day), in the form of a solution containing 0.1 to 1% of active ingredient (10 to 60 drops, once to three times per day), parenterally in the form of injectable ampoules containing 5 to 100 mg of active ingredient (3 to 8 ampoules per day). 

We claim:
 1. A compound having the formula ##STR80## wherein n is 1; R is 3-furylmethyl, benzyl or benzyl in which the ring is substituted with one or two halogens, methyl or cyano; R₁ is methyl or ethyl; R₂ is methoxy or ethoxy; R₃ is hydrogen, bromine, methoxy, nitro, acetyl, methylmercapto or ethylmercapto, with the proviso that when the set (R₃, n, R) is (H, 1, benzyl) the set (R₁, R₂) is not (CH₃, OCH₃), and pharmacologically acceptable acid addition salts thereof.
 2. A compound as claimed in claim 1 in which R is benzyl or benzyl in which the ring is substituted with one or two halogens, methyl or cyano, and R₃ is hydrogen, bromine, nitro or acetyl.
 3. A compound as claimed in claim 1 in which n is 1; R is ##STR81## R₁ is methyl; R₂ is methoxy and R₃ is hydrogen.
 4. A compound as claimed in claim 1 in which n is 1; R is ##STR82## R₁ is methyl; R₂ is methoxy and R₃ is hydrogen.
 5. A compound as claimed in claim 1 in which n is 1; R is ##STR83## R₁ is methyl; R₂ is methoxy and R₃ is hydrogen.
 6. A compound as claimed in claim 1 in which n is 1; R is ##STR84## R₁ is methyl; R₂ is methoxy; and R₃ is bromine.
 7. A compound as claimed in claim 1 in which n is 1; R is ##STR85## R₁ is ethyl; R₂ is methoxy; and R₃ is hydrogen.
 8. A compound as claimed in claim 1 in which n is 1; R is ##STR86## R₁ is methyl; R₂ is methoxy; and R₃ is hydrogen.
 9. A compound as claimed in claim 1 in which n is 1; R is ##STR87## R₁ is ethyl; R₂ is ethoxy; and R₃ is hydrogen.
 10. A compound as claimed in claim 1 in which n is 1; R is ##STR88## R₁ is methyl; R₂ is methoxy; and R₃ is hydrogen.
 11. A compound as claimed in claim 1 in which n is 1; R is ##STR89## R₁ is methyl; R₂ is methoxy; and R₃ is hydrogen.
 12. A compound having the formula ##STR90## wherein n is 1; R₅ is halogen, methyl or cyano; R₁ is methyl or ethyl; R₂ is methoxy or ethoxy, and pharmacologically acceptable acid salts thereof.
 13. A compound having the formula ##STR91## wherein n is 1; R₁ is methyl or ethyl; and R₂ is methoxy or ethoxy, with the proviso that the set (R₁, R₂) is not (CH₃, OCH₃), and pharmacologically acceptable acid addition salts thereof.
 14. The compound as claimed in claim 1, in which the set of substituents (n, R₁, R₂, R₃, R) is selected from the group consisting of (1, Et, EtO, H, Benzyl), (1, CH₃, OCH₃, OCH₃, benzyl), (1, Et, CH₃ O, H, Benzyl), (1, CH₃, EtO, H, benzyl), (1, Et, CH₃ O, CH₃ O, benzyl), (1, CH₃, OCH₃, NO₂, benzyl), (1, CH₃, OCH₃, Br, benzyl), (1, CH₃, OCH₃, SCH₃, benzyl), (1, CH₃, OCH₃, SC₂ H₅, benzyl), (1, CH₃, OCH₃, COCH₃, benzyl), ##STR92##
 15. A psychotropic pharmaceutical composition comprising a therapeutically effective amount of a compound as claimed in claim 1, in combination with a pharmaceutically acceptable carrier.
 16. An anti-emetic or anti-constipation pharmaceutical composition for treating the digestive system comprising a therapeutically effective amount of a compound as claimed in claim 1, in combination with a pharmaceutically acceptable carrier. 